package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,false);

        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
//        consumer.subscribe(Collections.singletonList("itheima-topic"));
        consumer.subscribe(Collections.singletonList("quickstart-topic-output"));


        //同步提交和异步提交偏移量
        try {
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.offset());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误的信息："+e);
        } finally {
            // 同步提交偏移量
            consumer.commitSync();
        }

        //当前线程一直处于监听状态
     /*   while (true) {
            //4.获取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.offset());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.partition());


               *//* try {
                    //同步提交偏移量
                    consumer.commitSync();
                } catch (Exception e) {
                    System.out.println("记录提交失败的异常："+e);
                }*//*

               *//* // 异步提交偏移量
                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if(e != null){
                            System.out.println("记录错误时的偏移量："+map+"记录错误的异常信息："+e);
                        }
                    }
                });*//*

                //同步提交和异步提交偏移量
                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if(e != null){
                            System.out.println("记录错误时的偏移量："+map+"记录错误的异常信息："+e);
                            consumer.commitSync();
                        }
                    }
                });
            }
        }*/

    }

}